Answer:
Fixed costs that can be avoided by discontinuing the line.
Step-by-step explanation:
Avoidable costs are those costs which can be eliminated by closing or rejecting a decision under evaluation. These costs are mostly variable coasts which vary with the change in activities. More activity more cost, less activity less cost and no activity no cost.
So fixed costs that can be avoidable by discontinuing the project is the only irrelevant cost between the given options.